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70 lines
1.9 KiB
C++
70 lines
1.9 KiB
C++
/***************************************************************************\
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*
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* MPEG Layer3-Audio Decoder
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* © 1997-2006 by Fraunhofer IIS
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* All Rights Reserved
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*
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* filename: bitsequence.h
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* project : MPEG Decoder
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* author : Martin Sieler
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* date : 1997-12-23
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* contents/description: HEADER - bitsequence object
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*
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*
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\***************************************************************************/
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/*
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* $Date: 2010/11/17 20:46:01 $
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* $Id: bitsequence.h,v 1.1 2010/11/17 20:46:01 audiodsp Exp $
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*/
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#ifndef __BITSEQUENCE_H__
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#define __BITSEQUENCE_H__
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/* ------------------------ includes --------------------------------------*/
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#include "bitstream.h"
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/*-------------------------- defines --------------------------------------*/
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/*-------------------------------------------------------------------------*/
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//
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// Bitstream parser class.
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//
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// This helper class is basically a numerical value that can read itself from
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// a CBitStream interface for convenience. The decoder almost completely
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// does the bitstream parsing through CBitSequence rather than CBitStream
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// directly.
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//
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class CBitSequence
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{
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public:
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CBitSequence(int nBits = 0) { m_nBits = nBits; m_nValue = 0; }
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virtual ~CBitSequence() {}
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void SetNumberOfBits(int nBits) { m_nBits = nBits; }
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int GetNumberOfBits() const { return m_nBits; }
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bool ReadFrom(CBitStream &Bs) { m_nValue = Bs.GetBits(m_nBits); return true; }
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bool ReadFrom_Bit(CBitStream &Bs) { m_nValue = Bs.Get1Bit(); return true; }
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bool ReadFrom(CBitStream &Bs, int nBits) { SetNumberOfBits(nBits); return ReadFrom(Bs); }
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bool Equals(int nValue) const { return (m_nValue == nValue); }
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int ToInt() const { return m_nValue; }
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void FromInt(int nValue) { m_nValue = nValue; }
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protected:
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private:
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int m_nBits;
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int m_nValue;
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};
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/*-------------------------------------------------------------------------*/
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#endif
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